Module interaction

'''Usage: theia [options] FNAME

Arguments:
  FNAME\t\t .tia format input file name.'''

'specify the FreeCAD library location. If none is specified, theia fin
ds it using the Unix `whereis` command. If option \'-c\', \'--no-CAD\'
  is used, the FreeCAD search and import are skipped as a whole.'

'Exclude beams propagating inside optics from text output, terminal ou
tput and CAD rendering files. This also changes the way beams are refe
renced to in these files and in the terminal output.'

u'''
	theia (C) 2017 Raphaël Duque
	License: GNU GPLv3+ <http://gnu.org/licenses/gpl.html>
	This is free software: you are free to change and redistribute it.
	There is ABSOLUTELY NO WARRANTY, to the extent permitted by law.
'''

'''

It looks like you reached the maximum recursion depth of your Python
implementation (generally around 1000). The beam tracer builds the bea
m tree
recursively and in your case the recursion went to far. The order and 
threshold
simulation parameters were made to prevent this situation. What you ca
...

'''theia: Error: The FreeCAD library was not found at the specified lo
cation %s. Usually it is in /usr/lib/freecad/lib. If you are not sure,
 omit the \'-l\', \'--FREECAD-lib\' option and theia will find the lib
rary on its own.
Aborting.'''

'''theia: Error: Unix command \'whereis freecad\' did not yield any di
rectory. Please make sure you have FreeCAD installed and that library 
location is in your $PATH.
Aborting'''

'''theia: Error: It seems that the Unix utility `whereis ` is not inst
alled, thus theia cannot find the FreeCAD libraries.
Either specify their location with the \'-l, --FreeCAD-libs\' option, 
or use the \'-c --no-CAD\' option to skip the CAD file writing step.''
'

'''theia: Error: %s was used as the source directory for the FreeCAD l
ibrary but an error occured, make sure your FreeCAD build is correct.
Aborting.'''